Drinking flask



FIG. 1 is a top, front and right side isometric view of a first embodiment of a drinking flask showing my new design;

FIG. 2 is a bottom, front and left side isometric view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation view, the left side being a mirror image thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a rear elevation view thereof;

FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 3 ;

FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 3 ;

FIG. 10 is a top, front and right side isometric view of a second embodiment of a drinking flask showing my new design;

FIG. 11 is a bottom, front and left side isometric view thereof;

FIG. 12 is a top plan view thereof;

FIG. 13 is a bottom plan view thereof;

FIG. 14 is a right side elevation view, the left side being a mirror image thereof;

FIG. 15 is a front elevation view thereof;

FIG. 16 is a rear elevation view thereof;

FIG. 17 is a cross-sectional view taken along line 17-17 of FIG. 12 ; and,

FIG. 18 is a cross-sectional view taken along line 18-18 of FIG. 12 .

The portions of the drinking flask shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a drinking flask, as shown and described. 